About Mansfield Township, NJ

mansfield township nj map
Written by NJroute22

About Mansfield Township, NJ

Most people I know accidentally call a lot of places they visit in Mansfield, NJHackettstown, NJ. It’s an honest mistake. But Mansfield is a pretty big city in New Jersey! In the top 20%!

A key rule of thumb: It’s “Mansfield” until you pass the Home Depot on Route 57.

Mansfield Township, Warren County, New Jersey

mansfield township nj perspective map

Wider view on where Mansfield, NJ is.

Mansfield Township is a township in Warren CountyNew Jersey, United States. As of the 2010 United States Census, the township’s population was 7,725, reflecting an increase of 1,072 (+16.1%) from the 6,653 counted in the 2000 Census, which had in turn declined by 501 (-7.0%) from the 7,154 counted in the 1990 Census. The township is part of the eastern region of the Lehigh Valley.

What is now Mansfield Township was formed on May 30, 1754, as Mansfield-Woodhouse Township from portions of Greenwich Township, while the area was still part of Sussex County, and was incorporated as Mansfield Township on February 21, 1798, as one of New Jersey’s initial group of 104 townships by an act of the New Jersey Legislature. The township became part of the newly formed Warren County on November 20, 1824. Portions of the township were taken to form Franklin Township (April 8, 1839) and Washington Township (April 9, 1849). The township was named after William Murray, 1st Earl of Mansfield.


According to the United States Census Bureau, the township had a total area of 29.928 square miles (77.514 km), including 29.815 square miles (77.221 km) of land and 0.113 square mile (0.293 km) of water (0.38%).

Anderson (with a 2010 Census population of 342), Beattystown (4,554) and Port Murray (129) are unincorporated communities and census designated places (CDPs) located within the township.

Other unincorporated communities, localities and place names located partially or completely within the township include Karrsville, Mount Bethel, Penwell, Rockport and Stephensburg.


Historical population
Census Pop.
1810 2,058
1820 2,787 35.4%
1830 3,310 18.8%
1840 3,057 * −7.6%
1850 1,615 * −47.2%
1860 1,688 4.5%
1870 1,997 18.3%
1880 1,709 −14.4%
1890 1,362 −20.3%
1900 1,324 −2.8%
1910 1,238 −6.5%
1920 1,133 −8.5%
1930 1,139 0.5%
1940 1,254 10.1%
1950 1,497 19.4%
1960 2,130 42.3%
1970 3,546 66.5%
1980 5,780 63.0%
1990 7,154 23.8%
2000 6,653 −7.0%
2010 7,725 16.1%
Est. 2014 7,535 −2.5%
* = Lost territory in previous decade

The Township’s economic data (as is all of Warren County) is calculated by the US Census Bureau as part of the Allentown-Bethlehem-Easton, PA-NJ Metropolitan Statistical Area.

Census 2010

At the 2010 United States Census, there were 7,725 people, 2,972 households, and 2,000 families residing in the township. The population density was 259.1 per square mile (100.0/km). There were 3,316 housing units at an average density of 111.2 per square mile (42.9/km). The racial makeup of the township was 86.73% (6,700) White, 4.89% (378) Black or African American, 0.18% (14) Native American, 3.21% (248) Asian, 0.03% (2) Pacific Islander, 3.06% (236) from other races, and 1.90% (147) from two or more racesHispanics or Latinos of any race were 10.94% (845) of the population.

There were 2,972 households, of which 31.4% had children under the age of 18 living with them, 51.8% were married couples living together, 10.7% had a female householder with no husband present, and 32.7% were non-families. 25.5% of all households were made up of individuals, and 7.7% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 3.08.

In the township, 22.9% of the population were under the age of 18, 7.9% from 18 to 24, 26.8% from 25 to 44, 29.7% from 45 to 64, and 12.8% who were 65 years of age or older. The median age was 40.7 years. For every 100 females there were 94.6 males. For every 100 females age 18 and over, there were 93.4 males.

The Census Bureau’s 2006-2010 American Community Survey showed that (in 2010 inflation-adjusted dollars) median household income was $74,063 (with a margin of error of +/- $8,316) and the median family income was $87,434 (+/- $8,330). Males had a median income of $56,567 (+/- $5,612) versus $41,583 (+/- $1,597) for females. The per capita income for the borough was $32,259 (+/- $2,751). About 5.1% of families and 6.3% of the population were below the poverty line, including 8.3% of those under age 18 and 3.9% of those age 65 or over.

Roads and highways

As of May 2010, the township had a total of 72.40 miles (116.52 km) of roadways, of which 46.85 miles (75.40 km) were maintained by the municipality, 16.79 miles (27.02 km) by Warren County and 8.76 miles (14.10 km) by the New Jersey Department of Transportation.

The only major roads that pass through are Route 31 which passes through briefly in the west, and Route 57 in the southern part.

No limited access roads traverse through. However, they are accessible two towns over such as Interstate 78 (in FranklinUnionClinton and Tewksbury townships) and Interstate 80 (in KnowltonHopeAllamuchy and Mount Olive townships).

Public transportation

A small general aviation airport, named Hackettstown Airport and holding the official database designation of (FAA LIDN05) is in Mansfield Township, only a few hundred yards from the municipal border with Hackettstown proper.

Rail service is provided into Hackettstown by New Jersey Transit over Norfolk Southern‘s Washington Secondary line which, in the Rockport section of Mansfield Township, passes the location of the Rockport Wreck, a train accident that occurred on June 16, 1925, that resulted in 50 fatalities.

Notable people

People who were born in, residents of, or otherwise closely associated with Mansfield Township include:

mansfield township nj map

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NJroute22 (site admin) is an avid traveler along NJ Route 22 (and almost all of central New Jersey!) Family man, pet lover, and property owner who has a natural curiosity for everything around.

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